Spellman ST SERIES Instruction Manual Download

Page: 15 / 108

ST/STR/STA MANUAL

118107-001 REV J

NOTE:    If  a  power  supply  fault,  or  system  monitoring
fault occurs, the power supply will revert to the POWER
DOWN  mode.    In  this  mode  the  output  power  will  be
turned off.  The CONTROL POWER ON lamp will flash
indicating  a  SYSTEM  FAULT.    To  reset  the  SYSTEM
FAULT cycle the CONTROL POWER ON switch, cycle
the  AC  line  power  or  toggle  the  RESET/EXTERNAL
INHIBIT signal line.

WARNING

AFTER TURNOFF, DO NOT HANDLE THE LOAD

UNTIL THE CAPACITANCE HAS BEEN

DISCHARGED! LOAD CAPACITANCE MAY BE

DISCHARGED BY SHORTING TO GROUND.

WARNING

THE VOLTMETER ON THE POWER SUPPLY

FRONT PANEL DOES NOT READ THE OUTPUT

VOLTAGE WHEN THE POWER IS TURNED OFF,

EVEN IF A CHARGE STILL EXISTS ON THE

LOAD.

CAUTION

TO ASSURE SAFETY AND PROPER COOLING

ALWAYS OPERATE THE UNIT WITH THE COVER

PANELS INSTALLED.

Fans  maintain  safe  operating  temperatures  in  the  power
supply  by  drawing  air  over  the  circuit  components.    The
covers must be on in order to direct the air flow over the
areas that need cooling.  In operation, the units air intake
and  fan  exhaust  paths  must  be  clear  of  any  obstructions
that might impede the flow of air.

3.2 Standard Features

A general note on remote interface circuitry and remote
signal grounding:

When usage applications dictate, electrical isolation may
be  required  when  interfacing  with  high  voltage  power
supply  in  question.    For  power  control  signals  such  as
CONTROL POWER, EXTERNAL INTERLOCK, HIGH
VOLTAGE  OFF  and  HIGH  VOLTAGE  ON  isolated
relay  contacts  should  be  used.    For  status  signals  and
control  signals  such  as  HIGH  VOLTAGE  ON,  HIGH
VOLTAGE  OFF,  EXTERNAL  INHIBIT,  etc.  opto-
isolation should be used. When usage applications dictate,
analog  programming  and  monitoring  signals  may  require
isolation  via  analog  isolation  amplifiers.    All  interface
cables  should  be  properly  shielded.    All  power  supply
signals should be referenced to the power supplies signal
ground on the rear panel interface connecter.

LOCAL/REMOTE

PROGRAMMING:

Allows

adjustment of the output voltage, current and power via

the front panel/internal controls (local) or external voltage
sources (remote).

LOCAL  CONTROL  -  In  local  control  (front  panel
control),  jumpers  are  installed  on  rear  panel  interface
connecter  between  pin  8  and  pin  9  for  current  control;
between  pin  10  and  pin  11  for  voltage  control  and
between  pin  42  and  pin  43  for  power  control.  This  will
enable  the  front  panel  potentiometers  for  current/voltage
control and the internal potentiometer for power control.

REMOTE  CONTROL  -  For  remote  programming,  the
above  mentioned  jumpers  are  removed  and  a  positive
polarity,  ground  referenced  voltage  source  is  applied  to
the  pin  8  for  current,  pin  10  for  voltage  and  pin  42  for
power.  Programming signals should be referenced to pin
1,  signal  ground.  Scaling  is  such  that  0-10Vdc
corresponds  to  0-100%  rated  output  respectively.      See
Figure 3.2A for wiring diagram.

An alternate method of controlling the output remotely is
by  using  external  resistance  such  as  a  potentiometer  or  a
resistor  network.    For  remote  control  the  jumpers  are
removed  and  the  desired  resistor  configuration  is
installed.  See Figure 3.2B for wiring diagram.

REMOTE MONITORS:

Test points are made available

on  the  rear  panel  interface  connecter  for  monitoring  the
current,  voltage  and  power;  pin  5,  pin  6  and  pin  25
respectively.  The  test  points  are  always  positive
regardless  of  the  output  polarity,  scaling  is  such  that  0-
10Vdc  corresponds  to  0-100%  rated  output  respectively.
Test  points  have  an  output  impedance  of  1k  ohms,  ±1%.
See Figure 3.3 for test point designation.

LOCAL/REMOTE CONTROL POWER / HIGH
VOLTAGE ON / HV OFF:

Allows for command of

CONTROL  POWER,  HIGH  VOLTAGE  ON  and  HIGH
VOLTAGE  OFF  by  either  the  front  panel  controls  or
external  signals  via  the  rear  panel  external  interface
connecter.

LOCAL  CONTROL  -  For  local  front  panel  switch
command of the Control Power functionality a maintained
connection  between  pin  12  and  pin  13  is  required.  Once
connected  as  outlined  above,  the  front  panel  CONTROL
POWER switch will alternate latch on/latch off with each
successive  pressing  of  the  switch.    For  local  front  panel
command  of  the  HIGH  VOLTAGE  OFF  functionality  a
maintained  connection  between  pin  14  and  pin  15  is
required.

REMOTE  CONTROL  –  Remote  control  of  CONTROL
POWER,  HIGH  VOLTAGE  ON  and  HIGH  VOLTAGE
OFF  can  be  accomplished  via  the  rear  panel  interface.
The  CONTROL  POWER  is  an  on-off  toggle  contact
between pins 12 and 13. With the front panel CONTROL
POWER  switch  latched  in  the  “ON”  position,  opening
and  closing  the  connection  between  pins  12  and  pins  13
will  allow  remote  command  of  the  CONTROL  POWER